Ok, this isn’t SharePoint related but hopefully it’ll be helpful to someone. We recently rolled out Livemeeting 2007 across the company. It turns out the client does a version check at the end of each meeting and will prompt the user to update.

livemeeting

Obviously you’ll want to suppress this for users who don’t have admin access. Create the following registry key on the client machine and set the value to 1

HKEY_LOCAL_MACHINE\Software\Microsoft\ Live Meeting\8.0\Lockdown

This and other useful reg keys (particularly in relation to OCS) are available here